A high dust emissivity index beta for a CO-faint galaxy in a filamentary Ly alpha nebula at z=3.1
Kato, Yuta1,2,3; Matsuda, Yuichi1,4; Iono, Daisuke1,4; Hatsukade, Bunyo5; Umehata, Hideki5,6; Kohno, Kotaro5,7; Alexander, David M.8; Ao, Yiping1,9; Chapman, Scott C.10; Hayes, Matthew11,12; Kubo, Mariko1; Lehmer, Bret D.13; Malkan, Matthew A.14; Michiyama, Tomonari4; Nagao, Tohru15; Saito, Tomoki16; Tanaka, Ichi17; Taniguchi, Yoshiaki18

We present CO J = 4-3 line and 3 mm dust continuum observations of a 100 kpc-scale filamentary Ly alpha nebula (SSA22 LAB18) at z = 3.1 using the Atacama Large Millimeter/submillimeter Array (ALMA). We detected the CO J = 4-3 line at a systemic z(CO) = 3.093 +/- 0.001 at 11 sigma from one of the ALMA continuum sources associated with the Ly alpha filament. We estimated the CO J = 4-3 luminosity of L'(CO(4-3)) = (2.3 +/- 0.2) x 10(9) Kkms(-1) pc(2) for this CO source, which is one order of magnitude smaller than those of typical z > 1 dusty star-forming galaxies (DSFGs) of similar far-infrared luminosity L-IR similar to 10(12) L-circle dot. We derived a molecular gas mass of M-gas = (4.4(-0.6)(+0.9)) x 10(9) M-circle dot and a star-formation rate of SFR = 270 +/- 160M(circle dot) yr(-1). We also estimated a gas depletion time of tau(dep) = 17 +/- 10 Myr, which is shorter than those of typical DSFGs. It is suggested that this source is in the transition phase from DSFG to a gas-poor, early-type galaxy. From ALMA to Herschel multi-band dust continuum observations, we measured a dust emissivity index beta = 2.3 +/- 0.2, which is similar to those of local gas-poor, early-type galaxies. From recent laboratory experiments, the specific chemical compositions needed to reproduce such a high beta for interstellar dust at the submillimeter wavelengths. ALMA CO and multi-band dust continuum observations can constrain the evolutionary stage of high-redshift galaxies through tau(dep) and beta, and thus we can investigate the chemical composition of dust even in the early Universe.

Keywordgalaxies: formation galaxies: high-redshift galaxies: ISM galaxies: starburst submillimeter: galaxies
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000456070400002
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Document Type期刊论文
Corresponding AuthorKato, Yuta
Affiliation1.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
2.Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1330033, Japan
3.CANON Elect Inc, Minato Ku, 3-5-10 Shibakoen, Tokyo 1050011, Japan
4.Grad Univ Adv Studies, SOKENDAI, Sch Sci, Dept Astron, Mitaka, Tokyo 1818588, Japan
5.Univ Tokyo, Grad Sch Sci, Inst Astron, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan
6.RIKEN Cluster Pioneering Res, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
7.Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan
8.Univ Durham, Dept Phys, Ctr Extragalact Astron, South Rd, Durham DH1 3LE, England
9.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
10.Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 4R2, Canada
11.Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, SE-10691 Stockholm, Sweden
12.Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden
13.Univ Arkansas, Dept Phys, 226 Phys Bldg,825 West Dickson, Fayetteville, AR 72701 USA
14.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
15.Ehime Univ, Res Ctr Space & Cosm Evolut, 2-5 Bunkyo Cho, Matsuyama, Ehime 7908577, Japan
16.Univ Hyogo, Ctr Astron, Nishi Harima Astron Observ, 407-2 Nichigaichi, Sayo, Hyogo 6795313, Japan
17.Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA
18.Open Univ Japan, Mihama Ku, 2-11 Wakaba, Chiba, Chiba 2618586, Japan
Recommended Citation
GB/T 7714
Kato, Yuta,Matsuda, Yuichi,Iono, Daisuke,et al. A high dust emissivity index beta for a CO-faint galaxy in a filamentary Ly alpha nebula at z=3.1[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2018,70(5):6.
APA Kato, Yuta.,Matsuda, Yuichi.,Iono, Daisuke.,Hatsukade, Bunyo.,Umehata, Hideki.,...&Taniguchi, Yoshiaki.(2018).A high dust emissivity index beta for a CO-faint galaxy in a filamentary Ly alpha nebula at z=3.1.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,70(5),6.
MLA Kato, Yuta,et al."A high dust emissivity index beta for a CO-faint galaxy in a filamentary Ly alpha nebula at z=3.1".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70.5(2018):6.
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